2015/12/31 by A. Sojasi, M. Mohsenzadeh, E. Yusofi
Physics and Astronomy · #Anisotropy #Black Holes and Theoretical Physics #Cosmic microwave background #Cosmology and Gravitation Theories #Excited state #Function (biology) #Galaxies: Formation, Evolution, Phenomena #Inflation (cosmology) #Mode (computer interface) #Observable #Planck #Spectral density #hep-th
paper · pdf · doi:10.1088/1674-1137/40/7/075101
accepted for publication in chinese physics c, 2016
arxiv created 2016/03/31 · arxiv updated 2016/04/01 · openalex created_date 2016/06/24 · openalex publication_date 2016/06/29 · openalex updated_date 2026/08/05
According to inflationary cosmology, the CMB anisotropy gives an opportunity to test predictions of new physics hypotheses.The initial state of quantum fluctuations is one of the important options at high energy scale, as it can affect observables such as the CMB power spectrum.In this study a quasi-de Sitter inflationary background with approximate de Sitter mode function built over the Bunch-Davies mode is applied to investigate the scale-dependency of the CMB anisotropy.The recent Planck constraint on spectral index motivated us to examine the effect of a new excited mode function (instead of pure de Sitter mode) on the CMB anisotropy at large angular scales.In so doing, it is found that the angular scale-invariance in the CMB temperature fluctuations is broken and in the limit ℓ < 200 a tiny deviation appears.Also, it is shown that the power spectrum of CMB anisotropy is dependent on a free parameter with mass dimension H << M * < Mp and on the slow-roll parameter .